Oxford
English Dictionary, at the University of Texashttp://oed.lib.utexas.edu/cgi-bin/oed/oed-copyhtml.sh?html=oed-browse&key1=497834081x524398(This is the code to get to the search page, which came up from an
MSN search. Use of the
OED is supposed to be restricted, according to another page. This,
then, is a hole).

"This may be inscribed in a church under
the two tablets of the Ten Commandments: ?PRSVR PRFCT MN VR KP THS
PRCPTS TN. The Vowel E Supplies the Key.?"-From the White Queen's
Dictionary of One Letter Words, Craig Conley, c 2000